Your error message says ""**Data**Format.error"". Unless that's a typo, it could probably be any column that has mixed data types. Is the source of the data you are pulling from Access a table, or some kind of SELECT query? If a query, can you alter the select statement temporarily to pull less records? For example, instead of: SELECT FIELD1, FIELD2 , use SELECT TOP 10 Field 1, Field2. You could also exclude columns from the query to determine which column the error is probably in.